Feed meohafism foe eollee mills



I 2 Sheets-Sheet 1.

N. W. HOLT.

FEED MECHANISM FQR ROLLER MILLS. No. 288,808.

(No Modei.)

Patented Nov. 20

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TL PETERS. PM Lilhngnpher, Wazhmgicn, D. C.

2 Sheets-She'et 2'.

(No Model.)

'N. w. HOLT.

FEED MEGH A EISM ROLLER MILLS. No. 288,808. Patented Nov. 20, 1883;

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UNITED STATES ATENT Fries.

NOAH W. HOLT, OF BUFFALO, NEW/V YORK.

FEED MECHANISM FOR ROLLER-MILLS.

SPECIFICATION forming part of Letters Patent No. 288,808, dated November20, 1883,

Application filed July 17, 1883. (No model.)

To all whom it may concern:

Be it known that I, can Vi. HOLT, of the city of Buffalo, in the countyof Erie and State of New York, have invented new and useful Improvementsin Feed Mechanism for Roller--Mills, of which the following is aspecification.

This invention relates to an improvement in the construction of themechanism whereby the material is fed between the grinding or crushingrollers. Heretofore revolving feedrollers have been most generallyemployed in roller-mills for feeding the material to the rollers; but itis found in practice that when the material is of an adhesive or fuzzycharacter the feed-rollers fail to feed the material uniformly over theentire length of the crushingrollers, whereby the operation of crushingor grinding is rendered irregular, and more or less unsatisfactory.

The object of my invention is to construct a feed mechanism which willdistribute the material over the entire length of the crushingrollers;and my invention consists of the improvements in the construction of thefeed mechanism, which will be hereinafter fully set forth, and pointedout in the claims.

In the accompanying drawings, Figure 1 is a vertical section of adouble-roller mill provided with my improved feed device. Fig. 2 is ahorizontal section in linear, Fig. 1. Fig. 3 is a vertical section inline 3 3 Fig. 1. Fig. 4 is a side elevation, partly in section, of myimproved feed mechanism on an enlarged scale.

Like letters of reference refer to like parts in the several figures.

A A represent two pairs of crushing or grinding rollers, arranged in acasing, B, and supported in bearings b, secured to a stationary frame,B, in a well'known manner.

0 0 represent the feed-hoppers, of ordinary construction, arranged abovethe rollers A A, and divided by a partition, 0, which terminates at itslower end in two downwardly-diverging inclined boards, 0.

D represents the outer inclined walls of the feed-hoppers, and E thefeed-gates, arranged at the lower ends of the outer walls, D, for

regulating the escape of the material from the feed-hoppers. Thefeed-gates E are automatiof the feed-hoppers.

in the feed-hoppers, and connected with the feed-gates by rods f, whichare attached to the feed-gates and rest against arms 6 projectingrearwardly from the feed-gates. The latter are provided with arms 6which are provided with pivots extending through the side walls 6 arearms secured to the outer ends of these pivots, and e are springs whichare secured to the outer side of the feed-hoppers in such manner thatthey are compressed or strained by the opening movement of thefeed-gates. These springs are provided with adjusting-nuts, wherebytheir tension can be regulated. The pressure of the material in thefeed-hopper upon the hinged board e tends to open the feed-gate, andthis movement is resisted by the spring,

so that the opening of the feed-gate is proportionate to the quantity ofmaterial contained in the feed-hopper.

F represents a movable board or plate arranged below thedischarge-openings of the feed-hoppers 0, immediately underneath thelower ends of the inclined walls 0 and the feedgates E, so that thematerial passes from the discharge-openings of the feed-hoppers directlyupon the plate F, and is to a certain extent supported by the latter. 9are agitatingpins secured to the upper side of the plate F, andprojecting upwardly into the dischargeopenings of the feed-hoppers forstirring and disintegrating the material in thethroats of the hoppers.The outer edges of the plate F are beveled or inclined,as shown at h,and connected with sieves H, which extend outwardly beyond the outerroller of each pair of grinding-rollers. The meshes of the sieves H aremade so coarse that they will permit all material which is to be reducedto pass through the sieves and between the rollers; and will only carrybeyond the rollers nails and other hard and large substances which mayaccidentally become mixed with the material as it is conveyed from onemachine to another in the mill. ,The plate F and sieves H areattachedtoa fram e, I, which is supported by spring bars or links 1',secured with their lower ends to the'inner sides of the casing B. Theframe Ircceives a reciprocating motion parallel with the longitudinalaxes of the rollers by an eccentric, j, which is mounteduponacountcr-shaft, j, and

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connected with the frame I by a rod, K. The shaft jis supported inbearings L, and rotated from one of the roller-shafts by an endlessbelt, m, running around a pulley, M, on the shaft j.

The plate F is provided on its upper side with ribs n, arranged on theinner sides of the inclined walls a, to prevent the material fromflowing backwardly on the plate F. The material contained in the throatsof the feed-hoppers O rests upon the plate F, and is constantly agitatedand disintegrated by the vibratory motion of the agitating-pins g, andevenly distributed over the entire width of the plate F,

underneath the discharge-openings of the feedhoppers. The material isfurther distributed as it passes over the edges h of the plate F and thesieves H, so that the feed is rendered uni-- form over the entire lengthof the rollers, and the clogging or accumulation of material upon anypart of the feed mechanism is entirely prevented. WVhen only one pair ofrollers is employed in the reduction-machine, the platecharge-opening ofthe feed-hopper to receive the material therefrom, agitating-pinssecured to said board or plate and projecting into the throat of thefeed-hopper, mechanism whereby a shaking motion is imparted to saidboard or plate, and a-feedgate adjustable toward and from said board orplate, substantially as setforth.

2. The combination,with the grinding mechanism, of a feed-hopper, aboard or plate arranged below the discharge-opening of the feed-hopperto-receive the material therefrom, agitating-pins secured to said boardor plate and projecting into the throat of the feed-hopper, mechanismwhereby a shaking motion is imparted to said board or plate, and ascreen attached to said board or plate and adapted to exclude the coarsematerial from the grinding mechanism, substantially as set forth.

3. The combination, with the feed-hopper, of a board or plate arrangedbelow the discharge-opening of the feed-hopper to receive the materialtherefrom, agitating-pins secured to said board or plate and projectinginto the throat of' the feed-hopper, mechanism where by ashaking motionis imparted to said board or plate, and feed-gate capable of automaticadjustment toward and from said board or plate, substantially as setforth.

. NOAH W. HOLT.

W'itnesses:

JNo. J BONNER, CHAS.- J. BUCHHEIT.

